[vsnet-grb-info 18564] GRB 161004A: Maidanak optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20012
SUBJECT: GRB 161004A: Maidanak optical observations
DATE:    16/10/08 00:26:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Pozanenko (IKI), B. Hafizov (UBAI), A. Volnova 
(IKI), O. Burhonov (UBAI) report on behalf of larger GRB follow-up 
collaboration:

We observed the field of GRB 161004A  (Evans  et al., GCN 19979) with 
AZT-22 telescope of Maidanak observatory equipped with SNUCAM in R 
filter starting on Oct. 04 (UT) 14:25:10. We  clearly detected optical 
afterglow  (Evans  et al., GCN 19979; Breeveld et al., GCN 19984; 
Mazaeva et al., GRB 20011). Preliminary photometry  of the afterglow in 
a combined image is following

Date         UT start   t-T0    Filter   Exp.     OT    Err.   UL
                        (mid, days)        (s)

2016-10-04   14:25:10  0.06981  R        15*120   22.0  0.15   22.7

Photometry is based on nearby SDSS-DR9 stars used in GCN 19980.